CN1322661C - Auxiliary output voltage control circuit of feedback power convertor prossessing magnetic amplifier - Google Patents
Auxiliary output voltage control circuit of feedback power convertor prossessing magnetic amplifier Download PDFInfo
- Publication number
- CN1322661C CN1322661C CNB021046174A CN02104617A CN1322661C CN 1322661 C CN1322661 C CN 1322661C CN B021046174 A CNB021046174 A CN B021046174A CN 02104617 A CN02104617 A CN 02104617A CN 1322661 C CN1322661 C CN 1322661C
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- output voltage
- loop
- auxiliary
- auxiliary output
- transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/16—Means for providing current step on switching, e.g. with saturable reactor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
Abstract
The present invention discloses a flyback power converter. The flyback power converter of the present invention comprises a transformer, wherein the transformer transmits input electric energy from a first side to a second side; the second side of the transformer comprises a primary output voltage circuit and at least a group of auxiliary output circuits connected with magnetic amplifiers. A pulse width modulation controller controls a switch of the primary side of the transformer so as to open the switch, close the primary output voltage circuit and the auxiliary output voltage circuits and store magnetic energy in windings of the primary side; the pulse width modulation controller also closes the switch and opens the primary output voltage circuit to provide primary voltage output and magnetically connect the primary voltage output to the magnetic amplifiers of the auxiliary output voltage circuits. The magnetic amplifiers are used as the switch of the auxiliary circuits to open the auxiliary output voltage circuits when the magnetization of the magnetic amplifiers is saturated and close the primary output voltage circuit to provide auxiliary output voltage. Therefore, an electric energy transfer time sharing function is arranged between the primary output voltage circuit and the auxiliary circuits to fully use the working duty ratio of the integral switch.
Description
Technical field
The present invention relates to a kind of configuration circuit and method of work thereof of power inverter, relate in particular to a kind of auxiliary output voltage control circuit of feedback of flyback power converter, this control circuit can be realized the effects such as simplification, the facility in the control, low manufacturing cost and auxiliary output voltage control accurately of circuit by the introducing of magnetic amplifier.
Background technology
Although known inverse excitation type converter has the simple and easy and advantage of low manufacturing cost of circuit arrangement, its design and product still are subject to the technical bottleneck of bigger auxiliary output voltage waveform.In addition, the auxiliary output voltage in this inverse excitation type converter has lower regulation rate according to the change of load.Because the existence of this lower regulation rate, therefore have relatively high expectations and need promptly need to be aided with in addition linear voltage adjusting stabilizer power is reduced greatly when control voltage output more accurately when voltage stability.For overcoming this bottleneck, yet can implement more complicated control circuit, converter simple in structure becomes more complicated but can make originally, thereby loses the simple advantage of its intrinsic configuration.
Figure 1A is the allocation plan of known flyback power converter, and wherein auxiliary output is not controlled.Its auxiliary output voltage V20 depends on the winding n1 and the n2 turn ratio of second side of main output voltage V10 and transformer.Especially, this output voltage satisfies a condition:
V10/n1＝V20/n2 (1)
Because the auxiliary output voltage of this circuit arrangement there is no the feedback of adjusting and controlling usefulness, so auxiliary output voltage is bigger with the fluctuation of load variations.
Figure 1B shows the known flyback power converter of use one linear regulator with control auxiliary output voltage V20.By assisting of linear regulator, auxiliary output voltage is more stable.Yet this type of circuit arrangement only is suitable for being applied in the situation of low power ranges.
See also shown in Fig. 1 C, for adopting the positive activation type power inverter of a magnetic amplifier as auxiliary output voltage control.Be that working method with voltage source realizes by transformer by first side to the electric energy of second side of carrying load conversion in this forward converter.According to the work duty ratio of pulse width control circuit, pulse width controller is used to stablize first output voltage.When implementing simultaneously with magnetic amplifier, forward converter has as the advantage of simplifying circuit and controlling mechanism shown in Fig. 1 C.Forward converter with magnetic amplifier also has the advantage of low electromagnetic interference.The efficacy performance of magnetic amplifier is regulated in the magnetic reset degree of controlling magnetic amplifier by feedback magnetic amplifier is become low-impedance time of delay by high impedance.The adjusting of the voltage evenness function that auxiliary output voltage also is subjected to output filter further and is showed is to provide stable output voltage.Magnetic amplifier is become the control of the voltage-time product that further is subjected to magnetic amplifier low-impedance time of delay.When pulse width control circuit during with the switch conduction of first side, the electric energy conversion will realize by the transformer under the voltage constant pattern.This magnetic amplifier realizes postponing the critical function that electric energy is transferred to auxiliary output through the magnetic amplifier feedback circuit controls.Existing many revealed technology and invention are used to dispose the magnetic amplifier in the forward converter.Use magnetic amplifier with the control auxiliary output voltage, the superior auxiliary output voltage of load variations is regulated to be realized.Yet, forward converter have than the inverse excitation type converter complexity the circuit arrangement of Duoing.
Therefore, still there are the needs that an inverse excitation type converter new and improvement is provided for the general technology of this area, to solve the technical bottleneck of flyback power converter previously discussed.
Summary of the invention
One of purpose of the present invention is to provide a magnetic amplifier for returning relaxation formula power inverter, improving the stability of auxiliary output voltage, thus the range of application of expansion flyback power converter and overcome the above bottleneck of carrying.
Particularly, magnetic amplifier of the present invention is together implemented with PDM keyer.It is for controlling the voltage of main output, utilizing magnetic amplifier to make auxiliary output voltage stable with the control auxiliary output voltage with time-sharing format in a switch periods that PDM keyer is provided.
Flyback power converter of the present invention comprises one by the transformer of first side transmission input electric energy to second side.Second side comprises that a main output voltage loop and at least one auxiliary output loop are connected with a magnetic amplifier in regular turn.A switch on one PDM keyer control transformer, first side is to open this switch and to cut out the main output voltage loop and the auxiliary output voltage loop, to store a magnetic energy on the winding of transformer.This PDM keyer is also further closed this switch and is opened the main output voltage loop, is connected to the magnetic amplifier in auxiliary output voltage loop so that principal voltage output and magnetization simultaneously to be provided.The function of this magnetic amplifier is as a subsidiary loop switch, when magnetic amplifier is magnetized to when saturated, open the auxiliary output voltage loop so that an auxiliary output voltage to be provided, and close the main output voltage loop simultaneously, thereby the power conversion effect of a timesharing is provided between main output voltage loop and auxiliary output voltage loop, utilizes whole switch work duty ratio with complete.
Description of drawings
Figure 1A shows that a tradition lacks the circuit diagram of the flyback power converter of auxiliary output voltage feedback control.
Figure 1B shows the circuit diagram of tradition with the flyback power converter of linear voltage stabilization piece implementation auxiliary output voltage control.
The circuit diagram of the forward power converter of the magnetic amplifier of Fig. 1 C demonstration tradition implementation one control auxiliary output voltage.
Fig. 2 shows the circuit diagram of the improvement flyback power converter of the magnetic amplifier of carrying out a control auxiliary output voltage.
Fig. 3 provides sequential chart with the change in voltage figure between main output voltage loop and auxiliary output voltage loop in the displayed map 2.
Fig. 4 shows the circuit diagram of the improvement flyback power converter with two groups of magnetic amplifiers of carrying out two auxiliary output voltages of a control.
Fig. 5 provides sequential chart to carry out the change in voltage waveform of timesharing between main output voltage loop in the displayed map 4 and a plurality of auxiliary output voltages loop.
Fig. 6 A to Fig. 6 C shows three groups of different circuit execution modes, uses the circuit diagram of two groups of magnetic amplifiers with the improvement flyback power converter of controlling two auxiliary output loops to prepare one.
Embodiment
See also shown in Figure 2ly, the electric energy transfer of flyback power converter of the present invention is to be realized to the working method of second side with constant current by first side of transformer.Electric energy transfer is to take place when the main switch S of first side closes.When switch S was closed, the electric energy that is stored in when switch open in the inverse-excitation type transformer inductance just was transferred to second side by transformer.Different with forward converter is that it is average so that output voltage is done filtering that flyback power converter output loop there is no inductance.To the flyback power converter, each output voltage is decided by to be connected to the turn ratio of first output and auxiliary each winding of transformer of exporting, and therefore, the function that the magnetic amplifier of this magnetic amplifier and forward power converter takes place is different.The electric energy transfer that flyback power converter of the present invention as shown in Figure 2 takes place is together to implement according to energy transfer time sharing principle as shown in Figure 3 with one.For realizing the purpose of electric energy transfer time-sharing facility, need make the auxiliary output loop height of unit number of turn voltage ratio of main output loop, that is,
(V110/n1)＞(V120/n2) (2)
The work duty ratio of supposing PDM keyer is D, PDM keyer is used for controlling the opening and closing of main switch, according to the unlatching of main switch S or close, this magnetic amplifier just close in regular turn and open with provide a height and Low ESR with the branch of realizing electric energy transfer up to output voltage V 110 and V120 with stable main output and auxiliary output voltage.Fig. 3 points out that then when D*Ts period main switch S unlatching, the inductance of the transformer first side winding n0 is by the voltage accumulation electric energy of input.Simultaneously, magnetic amplifier is closed, and section has high impedance and magnetic replacement at this moment.Period D1*Ts after main switch S is closed, the main output loop conducting at once of output voltage V 110.And, section at this moment, a voltage difference [V110* (n2/n1)-V120] is the magnetic energy of [V110* (n2/n1)-V120] * D1*Ts to magnetic amplifier magnetization with storage capacity.In case this magnetic amplifier is saturated, this magnetic amplifier just changes a low-impedance mode and auxiliary output loop conducting over to.Because condition V120/n2 is lower than V110/n1 (square formula 2), this negative bias voltage difference is closed the diode of main output loop.Therefore, within the period, have only the loop of auxiliary output voltage V120 to provide electric energy output at the D2*Ts of D1*Ts after the period.By the time of control magnetic amplifier D1*Ts, auxiliary output voltage can accurately be controlled.According to the above course of work, the relation equation formula of each output voltage and duty ratio is:
(Vi/n0)*D*Ts＝(V110/n1)*D1*Ts+(V120/n2)*D2*Ts (3)
D=D1+D2 wherein.Therefore, provide one by the binary output loop of PDM keyer and magnetic amplifier control.
According to Fig. 4 other flyback power converter of the present invention, wherein two magnetic amplifiers are used to dispose a flyback power converter 300.This Power Conversion is by main output voltage (showing as V210) and operates by two auxiliary output voltages (showing as V220 and V230).Voltage waveform and time sequential routine illustrate in Fig. 5.PDM keyer and the magnetic amplifier that is connected respectively on the two auxiliary output loops are controlled main output voltage V210 and auxiliary output voltage V220 and V230 jointly.
Similar in appearance to the operation principle that Fig. 2 and Fig. 3 stated, electric energy transfer is taken place under the constant current mode to second side by transformer first side.The transfer of electric energy is to take place when the main switch S of first side closes.When switch S was closed, the electric energy that is stored in the inductance of induction at the switch S open period just was transferred to second side by transformer.For realizing the purpose of the time-sharing facility that electric energy is changed, the unit number of turn voltage of the main output loop and the first and second auxiliary output loops will satisfy the requirement of formula (4).That is,
(V210/n1)＞(V220/n2)＞(V230/n3) (4)
The work duty ratio of supposing PDM keyer is D.When using the opening and closing of PDM keyer control main switch, the unlatching of corresponding main switch S or close, magnetic amplifier then cuts out in regular turn and is opened, and produce a height and Low ESR respectively, so that electric energy is transferred to output voltage V 210, V220 and V230 respectively with the form of timesharing, thereby stablize each output voltage.According to Fig. 5, when main switch S opened in the D*Ts period, the induction winding n0 of transformer first side is just by input electric energy accumulation electric energy.Simultaneously, magnetic amplifier just cuts out, the tool high impedance.This magnetic amplifier of section is reset at this moment.Subsequently D1*Ts period after main switch S closes, the main output loop of output voltage V 210 changes conducting into.And, at this moment the section, two different voltages [V210* (n2/n1)-V220] and [V210* (n3/n1)-V230] magnetize first and second magnetic amplifier respectively, store the magnetic energy of [V210* (n2/n1)-V220] * D1*Ts and [V210* (n3/n1)-V230] * D1*Ts amount respectively.In case first magnetic amplifier is saturated, first magnetic amplifier just transfers low-impedance mode to and the first auxiliary output loop changes conducting into.Because voltage V220/n2 is lower than V210/n1 (square formula 4), the voltage difference that the diode on the main output V210 is reversed is closed.Therefore, in the period, have only the loop of the first auxiliary output voltage V220 that energy output is arranged at the D2*Ts of D1*Ts after the period.
Section is magnetized operation and is still continued to carry out at the voltage of second magnetic amplifier with one [V220* (n3/n2)-V230] amount at this moment.In case second magnetic amplifier is saturated, second magnetic amplifier just transfers low-impedance mode to and conducting is changed in the loop that is connected to second magnetic amplifier into.Because voltage V230/n3 is lower than V210/n1 and V220/n2 (square formula 4), the diode that reaches on first subsidiary loop on the main output loop just is closed.At period D3*Ts, have only the loop of second output voltage V 330 that electric energy output is arranged.Segment length when resetting with control D1*Ts and D2*Ts by the energy of control magnetic amplifier, output voltage can accurately be controlled.According to above order, the equation of an expression electric energy transfer is:
(Vi/n0)*D*Ts＝(V210/n1)D1*Ts+(V220/n2)D2*Ts+(V230/n2)D3*Ts (5)
D=D1+D2+D3 wherein.Therefore, the power inverters of three tunnel outputs of being controlled by a PDM keyer and two magnetic amplification controllers are provided.
In order to satisfy the condition of equation 2 or equation 4, the circuit of second side must special design.Circuit arrangement can be implemented according to Fig. 6 A, Fig. 6 B and Fig. 6 C.Among Fig. 6 A, second side 305 of converter 300 comprises three Transformer Winding 310,320 and 330, the number of windings n310 that has nothing in common with each other in regular turn, n320 and n330.But winding number elasticity adjustment but must meet the following conditions:
(V310/n310)＞(V320/n320)＞(V330/n330) (6)
Since but number of windings n310, n320 and the adjustment of n330 elasticity, the circuit design of second side will have more elasticity.
In Fig. 6 B, second side 355 of converter 350 includes only one second winding.Therefore, listed number of windings n1=n2=n3 in the equation.For satisfying the condition of equation 4, require V360＞V370＞V380 shown in Fig. 6 B.In case because the design decision of transformer, the second side number of windings just has been fixed to constant, so the elasticity of circuit design is less.In Fig. 6 C, second side 405 of flyback power converter 400 comprises two windings that respectively have in regular turn for the n410 and the n420 number of windings.So the condition that present equation 4 sets becomes:
(V410/n410)＞(V420/n420)＞(V430/n430) (7)
The number of windings of winding n410 and n420 can together be adjusted with the parameter of other circuit element, to satisfy the set condition of equation 7.
Even the present invention has stated the embodiment of present preferred aspect, still must understand these contents that disclose and to be interpreted as its restriction.Be predicted by the person of being familiar with after the content that various variations and adjustment will be disclosed more than reading without doubt this area.In view of the above, appended claim scope tends to contain all variation in true spirit of the present invention and scope and adjustment.
Claims (8)
1, a flyback power converter comprises:
Shift the transformer of electric energy to the second side by first side; This second side comprises a main output voltage loop and at least one auxiliary output loop;
One is connected the switch on this first side;
One is connected to the magnetic amplifier of auxiliary output loop, is used for when reaching magnetic saturation, opens this auxiliary output voltage loop, closes this main output voltage loop simultaneously to provide an electric energy to this auxiliary output loop; And
Control the PDM keyer of this switch on this first side of this transformer, to open this switch, electric energy is stored in the inductance of transformer of this flyback power converter, and close this main output voltage loop, or close this switch, open this main output loop and be connected to this magnetic amplifier in this boost voltage loop so that principal voltage output and magnetization to be provided.
2, flyback power converter as claimed in claim 1 is characterized in that,
This main output voltage loop is connected to the main transformer winding of tool N0 circle so that a main output voltage V0 to be provided, and wherein N0 is a natural number; And
This auxiliary output voltage loop is connected to the auxiliary winding of transformer of tool N1 circle so that an auxiliary output voltage V1 to be provided, and wherein N1 is a natural number, and must satisfy condition (V0/N0)＞(V1/N1).
3, flyback power converter as claimed in claim 2 is characterized in that, further comprises:
The second auxiliary output voltage loop that one second transformer that is connected to tool N2 circle is assisted winding is to provide an auxiliary output voltage V2, and wherein N2 is a natural number, and must satisfy condition (V0/N0)＞(V1/N1)＞(V2/N2).
4, a flyback power converter comprises:
Shift the transformer of input electric energy to the second side by first side;
This second side comprises the auxiliary output loop of a main output voltage loop and at least one connection one magnetic amplifier; And this main output voltage loop and this auxiliary output voltage loop and this magnetic amplifier synergy, timesharing transmits energy to main output and an auxiliary output in a switch periods.
5, flyback power converter as claimed in claim 4 is characterized in that, further comprises:
One PDM keyer, this PDM keyer be in order to the switch on this first side of controlling this transformer, with the output voltage of controlling this main output voltage loop and control this magnetic amplifier by the auxiliary output voltage in this auxiliary output voltage loop.
6, flyback power converter as claimed in claim 5, it is characterized in that the effect of this magnetic amplifier is to be magnetized when this magnetic amplifier when saturated, makes auxiliary output loop conducting, and close main output loop, make originally to the extremely auxiliary output loop of the power transfer of main output loop output.
7, flyback power converter as claimed in claim 6 is characterized in that,
This main output voltage loop is connected to the main transformer winding of tool N0 circle so that a main output voltage V0 to be provided, and wherein N0 is a natural number; And
This auxiliary output voltage loop is connected to the auxiliary winding of transformer of tool N1 circle so that an auxiliary output voltage V1 to be provided, and wherein N1 is natural number and must satisfy condition (V0/N0)＞(V1/N1).
8, flyback power converter as claimed in claim 7 is characterized in that, further comprises:
The second auxiliary output voltage loop is connected to the auxiliary winding of second transformer of tool N2 circle so that an auxiliary output voltage V2 to be provided, and wherein N2 is natural number and must satisfy condition (V0/N0)＞(V1/N1)＞(V2/N2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/798,323 | 2001-03-02 | ||
| US09/798,323 US6483726B2 (en) | 2001-03-02 | 2001-03-02 | Auxiliary output voltage control circuit of flyback power converter with a magnetic amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1462108A CN1462108A (en) | 2003-12-17 |
| CN1322661C true CN1322661C (en) | 2007-06-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021046174A Expired - Fee Related CN1322661C (en) | 2001-03-02 | 2002-02-10 | Auxiliary output voltage control circuit of feedback power convertor prossessing magnetic amplifier |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6483726B2 (en) |
| CN (1) | CN1322661C (en) |
| TW (1) | TW538588B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3425418B2 (en) * | 2000-09-20 | 2003-07-14 | ティーディーケイ株式会社 | Step-up switching power supply |
| US6958270B2 (en) * | 2002-12-17 | 2005-10-25 | North Carolina State University | Methods of fabricating crossbar array microelectronic electrochemical cells |
| US7071582B2 (en) * | 2003-04-29 | 2006-07-04 | Delta Electronics, Inc. | Output rising slope control technique for power converter |
| US20060062027A1 (en) * | 2004-09-21 | 2006-03-23 | Hutchins Peter L | High efficiency switching power converter |
| JP2008048513A (en) * | 2006-08-11 | 2008-02-28 | Toshiba Corp | Semiconductor power conversion control device |
| US7675761B2 (en) * | 2007-06-01 | 2010-03-09 | Power Integrations, Inc. | Method and apparatus to control two regulated outputs of a flyback power supply |
| US7859869B2 (en) * | 2008-09-19 | 2010-12-28 | Power Integrations, Inc. | Forward converter transformer saturation prevention |
| US8143845B2 (en) * | 2008-12-17 | 2012-03-27 | Fairchild Semiconductor Corporation | Cable voltage drop compensation for battery chargers |
| CN101552563B (en) * | 2009-03-20 | 2011-09-14 | Bcd半导体制造有限公司 | Device and method for controlling constant-current output in switch power supply |
| US20110084949A1 (en) * | 2009-10-09 | 2011-04-14 | Ming-Chih Chiu | Power converters and e-paper devices using the same |
| WO2012015591A1 (en) * | 2010-07-29 | 2012-02-02 | Iwatt Inc. | Dual output power supply |
| US8890357B2 (en) | 2011-01-17 | 2014-11-18 | Balboa Water Group, Inc. | Bathing system transformer device with first and second low voltage output power connections |
| CN102255324B (en) * | 2011-08-10 | 2013-03-27 | 苏州盖娅智能科技有限公司 | Networking power compensation control system |
| US9401634B2 (en) | 2012-10-04 | 2016-07-26 | Power Integrations, Inc. | Saturation prevention in an energy transfer element of a power converter |
| US9343996B2 (en) | 2014-02-04 | 2016-05-17 | Pavel Dourbal | Method and system for transmitting voltage and current between a source and a load |
| SG10201401850RA (en) * | 2014-04-25 | 2015-11-27 | Rockwell Automation Asia Pacific Business Ct Pte Ltd | Motor Drive Switched Mode Power Supply Systems And Methods |
| CN106160206A (en) * | 2015-03-31 | 2016-11-23 | 通用电气公司 | Power-supply system and energy storage system |
| CN105429488A (en) * | 2015-12-16 | 2016-03-23 | 中国电子科技集团公司第四十三研究所 | Magnetic amplifier based switch power supply self-feedback circuit and control method therefor |
| CN109980943A (en) * | 2019-04-08 | 2019-07-05 | 北京承力电源有限公司 | A kind of two-way voltage-stabilizing Switching Power Supply of the voltage superposition based on magnetic amplifier |
| CN114839501B (en) * | 2022-07-04 | 2023-08-18 | 南京宏泰半导体科技股份有限公司 | High-efficiency test system and method for turn-off voltage of junction field effect transistor |
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| US4419723A (en) * | 1981-10-29 | 1983-12-06 | Bell Telephone Laboratories, Incorporated | Regulation of multiple-output DC-DC converters |
| US4881014A (en) * | 1986-03-31 | 1989-11-14 | Kabushiki Kaisha Toshiba | Stabilized electric power apparatus for generating direct and alternating current simultaneously in one transformer |
| US4935858A (en) * | 1989-09-05 | 1990-06-19 | Motorola, Inc. | Auxiliary output regulation technique for power supplies |
| US4967335A (en) * | 1989-09-21 | 1990-10-30 | Zenith Electronics Corp. | Saturable transformer regulator for flyback power supply |
| US5619403A (en) * | 1992-07-24 | 1997-04-08 | Canon Kabushiki Kaisha | Multi-output power supply apparatus |
-
2001
- 2001-03-02 US US09/798,323 patent/US6483726B2/en not_active Expired - Lifetime
- 2001-09-14 TW TW090122936A patent/TW538588B/en not_active IP Right Cessation
-
2002
- 2002-02-10 CN CNB021046174A patent/CN1322661C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4419723A (en) * | 1981-10-29 | 1983-12-06 | Bell Telephone Laboratories, Incorporated | Regulation of multiple-output DC-DC converters |
| US4881014A (en) * | 1986-03-31 | 1989-11-14 | Kabushiki Kaisha Toshiba | Stabilized electric power apparatus for generating direct and alternating current simultaneously in one transformer |
| US4935858A (en) * | 1989-09-05 | 1990-06-19 | Motorola, Inc. | Auxiliary output regulation technique for power supplies |
| US4967335A (en) * | 1989-09-21 | 1990-10-30 | Zenith Electronics Corp. | Saturable transformer regulator for flyback power supply |
| US5619403A (en) * | 1992-07-24 | 1997-04-08 | Canon Kabushiki Kaisha | Multi-output power supply apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| US6483726B2 (en) | 2002-11-19 |
| TW538588B (en) | 2003-06-21 |
| CN1462108A (en) | 2003-12-17 |
| US20020122326A1 (en) | 2002-09-05 |
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